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N. A. OTTO;

GAS ENGINE. 110,288,479. Patented Nov. 13, 1883.

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THE NORRIS PETERS ca, WASHINGTON, o. c.

I a r NITED ,NICOLAUS .A. came, on ,nnn'rz onrnn-nnmn, PnUssIA, GERMANY.

eAs-ENelNE.

SPECIFICATION forming part of Letters otent No. 288,479, dated November1'5, 1883;

v Application filed Mn will (He model.) *Iatented in England April 3,1E83,No.1,677.

To all whom, it"nmy concern a citizen of Prussia, residing atthe'Gas-Motoren-Falr'ik-Deutz, at Deutz-on-th'e'Rhine, in the GermanEmpire, have invented a new and'nsfulImprovement in Gas-Engines, (forwhich provisional protection has been obtained in Great Britain, No.1,677, dated April 3,:

the gas motor engine an auxiliary cylinder open to the atmosphere at oneend and provided at its closed end with a check-valve opening outward,which cylinder has a piston con nected to ac ank on the engine-shaft, soarranged that it makes its outstroke simultaneously with the o utstrokcof the working-piston. The piston of the auxiliary cylinder, at the endof its instroke, is situated close against the closed end of itscylinder, so that when it is made to perform its outstrokc during theworking-outstrokeof the engine-piston, a vacuum or partial v'aouum willbe formed behind it'in thecylinder, a portion of the power pro-.

auxiliary cylinder in forcing its piston inward.

Any air that may have leaked into the auxiliary cylinder during theoutstroke of its pistpn will be expelled through the before-mentionedchcch-valte on the reti'irn-stroke.

The'accompan yin g d rawin gshows a sectional plan of a gas-motor enginehaving two singlcacting working-cyinders a b, and provided with anauxiliary vacuum -'cylinder, (1, with discharge-valye 1', according tomy invention. The pistons a I) d are all connected to parallel cranks onthe engine-shaft 0, so as to make their out and instrokes together. Thepiston d moves close up to the bottom of the cylinder d at itsinstrolce,and expcls any air that Be it knownt-hat I, Nrconws AncusrOTTO,

may leak into the cylinderthrough the dis-' charge-valved, so that whenibis caused to 1 perform its outstroke during the working-outstroke ofthe pistons a Z), a vacuum orpart-ial vacuumis iormedbehind it, againstwhich the atm osph eric pressure actson the return-stroke.

From thetoregoing descriptionit will readily be seen that the unequalaction of single-act ing gas-motor engines will by this invention beeffectuallycompensated and a comparatively uniform motion be obtainedwithout the use of Jarge and heavy fly-wheels. As is well understood,the explosion of theicombust ible charge of such engines developes veryconsidcrable force during the working-outstroke of the piston, resultingina yery rapid outward motion of the. piston and correspondingly rapidsemi-revolution of the crankshaft, while the remainder of the revolutionof the latter and the return-stroke of the piston can. only be effectedby the expenditure of the 172 s mm stored up in the shall; and fly-wheelduringthe outstrokc; henceit follows that, unless the tly-wheel be madeineoiweniently large and massive, so as to enable it to store up a largeamount of ris eira',tho return-stroke of the pistonand second halfof-the revolutionof the shaft will take place at a com m-ratively slowspeed, theunstcady motion of the engine thus obtained rendering itunsuitable for work, such as driving dynamo-electric machines, requiringa'vcry uniform motion. Now, by expending a portion of the powerdeveloped during the working-outstroke in producing a vacuum in theauxiliary vacmnn-cylinder d, as above described, and then allowing themot-ivcpower thus stored up to be given off during the return-stroke ofthe piston, it will be veryfevidcnt that the power developed by theengine will practically be evenly distrib- I uted over the entirerevolution of the engine shaft, resultlng in a gr. atlyincreased uni- 1.In combiiiatioirwithagas-1notorengino,

, in which the-,admission and combustion of the gaseous charge iseffected only on one side of too 2 i seams the. piston, a separateeylii-ider whose piston during the instroke of the working-piston movesclose up to the bottom of the cylinder, so as to ex'pel allthe 'airtherefrom through a 5 discharge-valve, so that when the piston is madeto perform its outstroke during the working-outstroke of the workingpiston -or pistons, avaouum or partial vacuum is formed behind itagainst which the pressure of the atmosphere acts on the return-strokeof the piston, thus giving out the power again that had previ- '-ouslybeen expended informing the vacuum, substantially as described.

2. In gas-motor engines, the combination, I 5 with a single-actingworking-cylinder, of an auxiliary cylinder. 11, with disoharge-valve iand piston d, by whose outstroke avaouum or expelled through. the valvei, substantially as 20 and for the purposes. set forth. In testimonywhereof Ihave signed my name to this speoificatio11,' in the presence oftwo subseribing'witnesses,this 13th day 01' April, A. D. 1883.- I

NICOLAUS AUGUST OTTO.

.Wit-nesses:

.lH. REITMANN, SAMUEL SPACKMAX.

